Method and device for transmitting and receiving system information from a system supporting machine-to-machine communication

Abstract

The present invention relates to various methods and devices that receive and update system information that is used for machine-to-machine (M2M) communication in a wireless connection system supporting the machine-to-machine communication. As an embodiment of the present invention, the method of receiving system information on an M2M instrument from the wireless connection system supporting the M2M may include: receiving, at the M2M instrument, a first secondary superframe header subpacket (S-SFH SP 3) 3 message that includes information on a transmission period during which a second S-SFH SP 3 message including M2M-dedicated ranging information is transmitted; receiving, at the M2M instrument, the second S-SFH SP 3 message on the basis of the transmission period information; and receiving, at the M2M instrument, a system configuration descriptor message that includes updated system information, when the M2M-dedicated ranging information in the second S-SFH SP 3 shows that system information on M 2M is updated.

What is claimed is: 
     
       1. A method of receiving system information on a machine-to-machine (M2M) device in a wireless access system supporting M2M communication, the method comprising:
 receiving, by the M2M device, a first secondary superframe header subpacket3 (S-SFH SP3) message, 
 wherein the first S-SFH SP3 message comprises a system configuration descriptor (SCD) count field indicating a first configuration change count (CCC) associated with system configuration of an Advanced Air Interface (AAI)-SCD for a general mobile station other than the M2M device and an M2M SCD count field indicating a second CCC associated with system configuration of an AAI-SCD for the M2M device, 
 wherein the first S-SFH SP3 message comprises a S-SFH change cycle field indicating a minimum interval where content of a S-SFH is maintained and a periodicity of a M2M dedicated ranging field corresponding to two or more S-SFH change cycles; 
 receiving and decoding, by the M2M device, a second S-SFH SP3 message among a plurality of transmitted S-SFH SP3 messages at only a time position determined based on periodicity information indicated by the periodicity of the M2M dedicated ranging field; and 
 when a M2M SCD count field contained in the second S-SFH SP3 message indicates that the system information on the M2M device is updated, receiving and decoding, by the M2M device, a AAI-SCD message containing the updated system information for the M2M device. 
 
     
     
       2. The method of  claim 1 , wherein the periodicity information indicates the transmission period of the second S-SFH SP3 message on the basis of a superframe in which the first S-SFH SP3 message is received. 
     
     
       3. A method of receiving system information on a machine-to-machine (M2M) device in a wireless access system supporting M2M communication, the method comprising:
 receiving, by the M2M device, a primary superframe header (P-SFH) message, 
 wherein the P-SFH message comprises an M2M dedicated ranging indicator indicating whether a M2M system configuration descriptor (SCD) count field contained in a first secondary superframe header subpacket3 (S-SFH SP3) message is updated and a S-SFH change bitmap field indicating whether there is a change between the first S SFH SP3 message and a second S SFH SP3 message which was previously transmitted, 
 wherein the S-SFH change bitmap field is not used by the M2M device; 
 when the M2M dedicated ranging indicator indicates that the M2M SCD count field is updated, receiving and decoding, by the M2M device, the first S-SFH SP3 message during an S-SFH change cycle in which the P-SFH message is received, 
 wherein the first S-SFH SP3 message comprises an SCD count field indicating a first configuration change count (CCC) associated with system configuration of an Advanced Air Interface (AAI)-SCD for a general mobile station other than the M2M device and the M2M SCD count field indicating a second CCC associated with system configuration of an AAI-SCD for the M2M device; and 
 when the M2M SCD count field contained in the first S-SFH SP3 message indicates that the system information on the M2M device is updated, receiving and decoding, by the M2M device, a AAI-SCD message containing the updated system information for the M2M device. 
 
     
     
       4. The method of  claim 3 , wherein the P-SFH message is received in every superframe. 
     
     
       5. A machine-to-machine (M2M) device for receiving system information on the M2M device in a wireless access system supporting M2M communication,
 the M2M device comprising: 
 a radio frequency (RF) module; and 
 a processor configured to control reception of the system information, 
 the processor configured to control the RF module to: 
 receive a first secondary superframe header subpacket3 (S-SFH SP3) message, 
 wherein the first S-SFH SP3 message comprises a system configuration descriptor (SCD) count field indicating a first configuration change count (CCC) associated with system configuration of an Advanced Air Interface (AAI)-SCD for a general mobile station other than the M2M device and an M2M SCD count field indicating a second CCC associated with system configuration of an AAI-SCD for the M2M device, 
 wherein the first S-SFH SP3 message comprises a S-SFH change cycle field indicating a minimum interval where content of a S-SFH is maintained and a periodicity of a M2M dedicated ranging field corresponding to two or more S-SFH change cycles, 
 receive and decode a second S-SFH SP3 message among a plurality of transmitted S-SFH SP3 messages at only a time position determined based on periodicity information indicated by the periodicity of the M2M dedicated ranging field, 
 when a M2M SCD count field contained in the second S-SFH SP3 message indicates that the system information on the M2M device is updated, receive and decode a AAI-SCD message containing the updated system information for the M2M device. 
 
     
     
       6. The M2M device of  claim 5 , wherein the periodicity information indicates the transmission period of the second S-SFH SP3 message on the basis of a superframe in which the first S-SFH SP3 message is received. 
     
     
       7. A machine-to-machine (M2M) device for receiving system information on the M2M device in a wireless access system supporting M2M communication,
 the M2M device comprising: 
 a radio frequency (RF) module; and 
 a processor configured to control reception of the system information, 
 the processor configured to control the RF module to: 
 receive a primary superframe header (P-SFH) message, 
 wherein the P-SFH message comprises an M2M dedicated ranging indicator indicating whether a M2M system configuration descriptor (SCD) count field contained in a first secondary superframe header subpacket3 (S-SFH SP3) message is updated and a S-SFH change bitmap field indicating whether there is a change between the first S-SFH SP3 message and a second S SFH SP3 message which was previously transmitted, 
 wherein the S-SFH change bitmap field is not used by the M2M device, 
 when the M2M dedicated ranging indicator indicates that the M2M SCD count field is updated, receive and decode the first S-SFH SP3 message during an S-SFH change cycle in which the P-SFH message is received, 
 wherein the first S-SFH SP3 message comprises an SCD count field indicating a first configuration change count (CCC) associated with system configuration of an Advanced Air Interface (AAI)-SCD for a general mobile station other than the M2M device and the M2M SCD count field indicating a second CCC associated with system configuration of an AAI-SCD for the M2M device, 
 when the M2M SCD count field contained in the first S-SFH SP3 message indicates that the system information on the M2M device is updated, 
 receive and decode a AAI-SCD message containing the updated system information for the M2M device. 
 
     
     
       8. The M2M device of  claim 7 , wherein the P-SFH message is received in every superframe.